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We do not understand nature, we measure it

18 Nov 2010, 20:55 UTC
We do not understand nature, we measure it
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The Great Debate is over. In the next days you will be able to see it here. Although I had plenty of urgent things to do, I could not resist to follow the live blog by Marcel Pawlowski and Andreas K├╝pper, who kept reporting and answering questions for the whole duration of the debate. It was an interesting experience. From what I can judge, the presentation by Simon White was very relaxed, and did not touch upon possible alternative scenarios. After a general introduction on Dark Matter, White went through all evidences, including the famous Bullet Cluster. One of the points he made was that neutron and neutrino were predicted/invoked well before they were discovered. In particular, the neutrino was postulated in 1930, but confirmed only in 1956. Something similar might be happening for dark matter particles. DM was postulated by F. Zwicky in 1933, but the particle has not been found. At least not yet. For some time there were hopes that the neutrino could be the one, but with the mass limits set for it, there is not much neutrinos can do for DM.
The first slide by Pavel Kroupa (photo courtesy of M. Pawlowski). LCDM is ruled ...

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